Spectral analysis of 30 Wolf-Rayet stars

Details Spectral analysis of 30 Wolf-Rayet stars Spectral analysis of 30 Wolf-Rayet stars

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..236s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 236-248.

Astronomy and Astrophysics

Astrophysics

267

Spectrum Analysis, Stellar Luminosity, Stellar Spectra, Stellar Temperature, Wolf-Rayet Stars, Helium, Hydrogen, Radiative Transfer, Stellar Atmospheres, Stellar Evolution, Stellar Magnitude

Scientific paper

The helium spectra of 30 Galactic WR stars are analyzed, and the luminosities, radii, temperatures, and mass-loss rates are determined. The analyses are based on model calculations which account for non-LTE radiation transfer in spherically expanding atmospheres. A three-dimensional grid of models is established for a wide range of stellar radii, temperatures, and mass-loss rates. The variety of resulting spectra is actually two-dimensional, as different combinations of stellar radius and mass-loss rates may yield very similar helium spectra at a given stellar temperature. Thus, the WR spectra can be described by a two-dimensional classification scheme. Individual mass-loss rates between 10 exp -3.9 and 10 exp -5.3 are found. The luminosities of WNE subtypes scatter between 10 exp 5 and 10 exp 5.5 solar luminosities while those for the late subtypes are higher. The WC stars are less luminous.

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